EP2813129B1 - Table de cuisson par induction à champ de bobines d'induction - Google Patents

Table de cuisson par induction à champ de bobines d'induction Download PDF

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Publication number
EP2813129B1
EP2813129B1 EP13713230.4A EP13713230A EP2813129B1 EP 2813129 B1 EP2813129 B1 EP 2813129B1 EP 13713230 A EP13713230 A EP 13713230A EP 2813129 B1 EP2813129 B1 EP 2813129B1
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EP
European Patent Office
Prior art keywords
sensor
sensors
inductor coils
induction hob
preparation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP13713230.4A
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German (de)
English (en)
Other versions
EP2813129A1 (fr
Inventor
Wolfgang Beifuss
Uwe Has
Sergio Llorente Gil
David Paesa García
Michael Reindl
Julio Rivera Peman
Melanie SCHÖRGHOFER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BSH Hausgeraete GmbH
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BSH Hausgeraete GmbH
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Publication of EP2813129A1 publication Critical patent/EP2813129A1/fr
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Publication of EP2813129B1 publication Critical patent/EP2813129B1/fr
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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/12—Cooking devices
    • H05B6/1209—Cooking devices induction cooking plates or the like and devices to be used in combination with them
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
    • H05B2213/03—Heating plates made out of a matrix of heating elements that can define heating areas adapted to cookware randomly placed on the heating plate
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
    • H05B2213/07—Heating plates with temperature control means

Definitions

  • the invention relates to an induction hob having an inductor coil field with a plurality of arranged below a preparation plate inductor coils for free positioning of a preparation container on the preparation plate.
  • An induction hob with a sensor device having a first sensor is known, which is capable of detecting measured values for determining a temperature of a defined preparation zone on which a preparation container for receiving a preparation material can be set up, and with an IR sensor which detects heat radiation of the preparation zone and a bottom of the preparation container, and an evaluation unit, which is electrically connected to the sensor and the IR sensor and with which, depending on the information transmitted by the sensors, the temperature of the soil can be determined, wherein the two sensors are arranged such in that their local detection areas are arranged overlapping at least in regions, in particular substantially completely overlapping.
  • the sensors are arranged on a central recessed portion of a respective inductor, wherein each preparation zone is associated with a corresponding inductor.
  • each preparation zone is associated with a corresponding inductor.
  • some preparation containers have on the underside of their bottom a centrally placed discoloration (eg a red dot) or a stamp mark which can falsify a temperature reading by means of the IR sensor.
  • an induction hob which has an inductor coil field of many comparatively small inductor coils, so that a cooking utensil can be positioned freely on the induction hob. It is disadvantageous that due to the free positioning of the preparation container, a lateral IR temperature sensing only difficult is feasible. Due to the small size of the inductor coils but also a lower-side IR-sensing after DE 10 2006 026 907 A1 disadvantageous because the recessed area in the middle of the inductors, which must have a certain minimum size, a performance of the inductors significantly affected. Consequently, RFID systems with special system pots, which are equipped with an RFID temperature sensor, and a central radio receiver have been used for temperature sensing on a freely positionable induction hob.
  • EP 2 413 659 A1 relates to an induction cooking appliance with a plurality of temperature sensors, which are arranged between a plurality of arranged under a hotplate coils. With the help of heat exchangers heat is transferred from arranged in the adjacent environment of a temperature sensor coils to the temperature sensor.
  • WO 2011/148568 A1 relates to an induction cooker comprising a main induction coil and at least one secondary induction coil, which are controlled in a coordinated manner.
  • the main inductor and the secondary inductors are associated with infrared sensors for detecting the temperature of a heated object.
  • an induction cooktop comprising an inductor coil array with a plurality of inductors arranged below a preparation plate for free positioning of a preparation container on the preparation plate. At least one infrared (IR) sensor is arranged below the preparation plate and laterally next to the inductor coils.
  • IR infrared
  • the inductor coils arranged in this way are not each assigned to a solid, local preparation zone for attaching a preparation container.
  • the preparation container can be arranged freely on the preparation plate, and the typically covered by the preparation container, typically several (small) inductor coils are automatically detected and activated (pan detection).
  • An arrangement of the at least one IR sensor laterally next to the inductor coils can in particular comprise that a measuring range of the at least one IR sensor is located laterally next to the inductor coils, while at least parts of the sensor as such can also be located elsewhere.
  • the at least one IR sensor may also be located laterally next to the inductor coils.
  • the preparation plate may also be referred to as a cover plate and is in particular permeable to the magnetic field generated by the inductor coils and to the IR measurement range which can be sensed by the at least one IR sensor.
  • the preparation plate may in particular be a plate made of glass (including hard glass) or glass ceramic.
  • Such an induction hob has the advantage that the at least one IR sensor does not affect the effectiveness of the (small) inductor coils.
  • at least one such IR sensor is in an edge area, i. off-center, arranged to an attached preparation container, so that a high measurement accuracy is possible.
  • the arrangement of the at least one IR sensor is also easily selectable over the area of the preparation plate.
  • a diameter of the inductor coils is between 5 cm and 10 cm.
  • the inductor coils are arranged in a close-packed pattern in plan view of the induction hob and at least one IR sensor is arranged in a gap of the inductor coils. This allows a high packing density and thus a high energy transfer per unit area and at the same time an IR measurement.
  • a dense-packed pattern can be understood in particular to mean an arrangement of the inductor coils in which adjacent inductor coils are arranged directly or with only a small distance from one another.
  • the close-packed pattern may be a regular pattern.
  • the densely packed pattern corresponds to a hexagonal closest packing. This allows a particularly high packing density.
  • a gap results in each case between three arranged as the tips of a triangle inductor coils.
  • a gap results in each case between four inductor coils arranged as corners of a square.
  • At least one IR sensor is arranged between two adjacent inductor coils on at least one edge of the inductor coil field.
  • an IR sensor is arranged in all gaps of the inductor coils. This allows a particularly dense IR temperature measurement.
  • an IR sensor is arranged only in some gaps (L) of the hexagonal closest packing of the inductor coils.
  • L the number of IR sensors can be reduced, which saves costs. For example, only every second gap in each direction may be filled.
  • the IR sensors may also be present in an irregular arrangement, which enables effective temperature sensing in a particularly small number of IR sensors.
  • the at least one IR sensor (4) is arranged such that a circular area on the hob with a diameter of at least 20 cm comprises at least one IR sensor. This ensures that a bottom of a usually small standard cooking pot can be sensed by at least one IR sensor and thus a safe temperature control is made possible even for small cooking pots.
  • a minimum number of IR sensors is present and arranged, so that a circular area on the hob with a diameter of at least 20 cm comprises at least two IR sensors. This allows an even safer and also for at least one sensor off-center IR temperature determination.
  • the induction hob is adapted to detect inductors used for operating a particular cookware, to determine based on the detected inductor coils which IR sensors are covered by the particular cookware and only those IR sensors for temperature determination of the particular preparation harness. This makes it possible to achieve a particularly accurate IR temperature measurement of the particular preparation dishes.
  • the detection of the inductor coils can be carried out by known methods, e.g. a "pan detection".
  • Determining which IR sensors are covered by the particular preparation harness may in particular comprise determining or deriving a shape of the preparation container from the identified inductor coils and using IR sensors located within this form for IR temperature measurement.
  • Determining which IR sensors are covered by the particular preparation harness may include, in particular, using those IR sensors for IR temperature measurement which are in a gap whose inductor coils forming the gap are all usable for operating the particular preparation harness ,
  • Determining which IR sensors are covered by the particular preparation harness may also include using those IR sensors for IR temperature measurement which are in a gap, the gap forming inductor coils of which are predominantly usable to operate the particular preparation harness (eg two out of three inductor coils or three out of four inductor coils).
  • IR sensors which are arranged peripherally in relation to the preparation plate or the arrangement of the inductor coils, may for example be used for IR temperature measurement if both inductor coils, between which the IR sensor is located, are covered by the particular preparation utensil,
  • the induction hob is adapted to determine on the basis of the detected inductor coils, which IR sensors (ie, which at least one sensor) are covered by a peripheral region of the particular preparation dishes and only such IR sensors for temperature determination of the particular preparation harness. As a result, a measurement falsification by a bottom center of the preparation container is avoided.
  • This embodiment may in particular only become effective if at least one IR sensor is covered by an edge region of the particular preparation harness.
  • a plurality of temperature sensors in particular (real or virtual, see below) IR sensors, can be used to determine the temperature of the particular preparation dishes, their measured values can be averaged, in particular weighted, to provide a single temperature value.
  • a plurality of contact temperature sensors on the preparation plate laterally offset (and thus spaced) are attached to the IR sensors.
  • the contact temperature sensors an influence of a heating of the cooking plate on the IR temperature measurement can be considered.
  • the induction hob is adapted to evaluate signals correlated to at least one of the particular preparation dishes covered, adjacent arranged pair of an IR sensor and a contact temperature sensor. It is exploited that, surprisingly, there is a reliable relationship between the signals of the IR sensor and the contact temperature sensor and from a sensor signal of a located at the location of the contact temperature sensor "virtual" IR sensor with sufficient accuracy can be derived. Consequently, a temperature measurement of the bottom of a preparation harness at locations of the real IR sensors and the virtual IR sensors can be performed. As a contact temperature sensor typically less expensive than an IR sensor, a dense yet inexpensive IR-based temperature determination is possible. Multiple assignments of a sensor are possible.
  • the contact temperature sensor may in particular be designed as an NTC sensor or as a PTC sensor.
  • the contact temperature sensors are arranged centrally with respect to the inductor coils.
  • no large opening in the inductor coil is needed because the contact temperature sensor may be arranged, for example, above the inductor coil and only one or two thin associated electrical lines need to be laid or a typically thinner temperature sensor needs to be passed through a small hole through the inductor coil , Consequently, an effectiveness of the inductor coil is not or not significantly limited.
  • a virtual IR temperature measurement can be provided centrally on the inductor coils.
  • contact temperature sensors are arranged on all inductor coils, resulting in a particularly dense measuring field.
  • an IR temperature measurement can be used to control a temperature of the preparation vessel or of ingredients contained therein. Also, an IR temperature measurement can be used to detect hazardous situations, e.g. to determine an overheating of the preparation vessel.
  • a preparation vessel may be in particular a cookware such as a saucepan, a pan, a roaster, etc., but also any other inductively heatable essay.
  • FIG. 1 shows a top view of a preparation plate 2 of an induction hob 1 with a plurality of inductors 3 located below the preparation plate 2.
  • the inductors 3 form a hexagonal close-packed arrangement, adjacent inductor coils 3 at least approximately directly adjoining each other (ie without a significant distance).
  • a preparation container Z whose lateral outer contour K of its bottom is indicated by dashed lines can be positioned and operated freely on the preparation plate 2.
  • the inductor coils 3 are formed comparatively small, here with a diameter of about 8 to 8.5 cm.
  • the preparation container Z shown has a diameter of 20 cm, which corresponds to a smallest standard size.
  • the induction hob 1 further comprises a plurality of below the preparation plate 2 located IR sensors 4, which or their measuring spots are located laterally next to the inductor coils 3.
  • a plurality of attached to a bottom of the preparation plate 2 contact temperature sensors 5 in the form of NTC elements in a central region relative to the inductor coils 3 and thus laterally offset from the IR sensors 4 are present.
  • Some IR sensors 4, 4a are located in a respective gap L of the inductor coils 3 and are surrounded by three inductor coils 3 in the hexagonal closest packing shown.
  • Other IR sensors 4, 4b are located with respect to the arrangement of the inductor coils 3 at one edge, there between two adjacent inductor coils 3rd
  • the induction hob 1 is shown in two different embodiments, namely in a first embodiment A shown below and a second embodiment B shown above, which are separated from each other by a line G.
  • an IR sensor 4 is arranged in all gaps of the hexagonal closest packing of the inductor coils 3, which results in a particularly dense IR measuring field.
  • an IR sensor 4 is arranged, which saves IR sensors 4 and thus allows a particularly inexpensive induction hob 1.
  • those inductor coils 3 are recognized, which are suitable for inducing a current in the bottom of the preparation container Z for its operation and can be activated accordingly.
  • this may be any inductor coil 3 that is covered beyond its midpoint.
  • these are all seven of the inductor coils 3, 3z which are at least partially covered by them.
  • Such a detection of the inductor coils 3z is already known and therefore need not be further elaborated here.
  • IR sensors 4 are covered by the particular preparation harness, namely at least all, here: two, IR sensors 4, 4z, which occupy a gap formed by the inductor coils 3z are located. Only these (two) IR sensors 4z from the set of all IR sensors 4 are used to determine the temperature of the particular preparation dishes Z.
  • At least eight sensors 4 are covered at each position of the preparation dish Z, which enables a highly accurate, possibly even spatially resolved temperature measurement
  • at least two IR sensors 4 are also provided in the induction hob 1 according to embodiment B. covered. Thereby, an accuracy-increasing measurement redundancy can be achieved, or an IR sensor 4 can be ignored if it is determined that it is located at a central portion of the particular preparation harness Z. Since the bottom of the preparation container Z has the minimum diameter of 20 cm, this applies all the more for even larger preparation containers.
  • the number and arrangement of the IR sensors 4 in the induction hob 1 according to embodiment B be designed so that a minimum number of IR sensors 4 results, of which always at least two IR sensors 4 from a preparation container Z with a minimum Standard diameter of its soil, eg from 20 cm, are covered.
  • the number and arrangement of the IR sensors 4 may also be configured for simultaneous coverage of only one IR sensor 4 or of three or more IR sensors 4.
  • a connection between the signals of the IR sensor 4 and the contact temperature sensor 5 can be established, in particular for adjacent pairs of an IR sensor 4 and a contact temperature sensor 5, and from this a sensor signal of a "virtual" IR sensor located at the location of the contact temperature sensor 5 be derived with sufficient accuracy. Consequently, a temperature measurement based on an IR detection at the bottom of the preparation harness Z shown can be evaluated at nine locations (at two real locations of the IR sensors 4z and seven "virtual" locations of the contact temperature sensors 5 of the inductor coils 3z).
  • a (real or virtual) IR sensor for temperature measurement may be ignored if it is in the middle or in a defined area around the center of the bottom of the preparation dish Z, here e.g. the central virtual IR sensor.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Induction Heating Cooking Devices (AREA)
  • Cookers (AREA)

Claims (10)

  1. Table de cuisson par induction (1) présentant un champ de bobines d'induction avec plusieurs bobines d'induction (3) disposées en dessous d'une plaque de préparation (2) pour un positionnement libre d'un récipient de préparation (Z) librement sur la plaque de préparation (2), au moins un détecteur à IR (4, 4z) étant disposé en dessous de la plaque de préparation (2) et latéralement à côté des bobines d'induction (3),
    caractérisée en ce que
    en dessous de la plaque de préparation (2) se trouvent plusieurs détecteurs de température de contact (5) sur la plaque de préparation (2), latéralement décalés par rapport aux détecteurs à IR (4).
  2. Table de cuisson par induction (1) selon la revendication 1, caractérisée en ce que la table de cuisson par induction (1) est prévue pour évaluer par corrélation les signaux d'au moins une paire constituée d'un détecteur à IR (4z) et d'un détecteur de température de contact (5) agencée à proximité et recouverte de vaisselle destinée aux préparations (Z).
  3. Table de cuisson par induction (1) selon l'une des revendications précédentes, caractérisée en ce que les détecteurs de température de contact (5) sont disposés centralement par rapport aux bobines d'induction (3) en particulier sur toutes les bobines d'induction (3).
  4. Table de cuisson par induction (1) selon l'une des revendications précédentes, caractérisée en ce que les bobines d'induction (3), en vue de dessus sur la table de cuisson par induction (1), sont disposées en un modèle compact, en particulier un assemblage hexagonalement très dense et au moins un détecteur à IR (4a) est disposé dans un trou (L) des bobines d'induction (3).
  5. Table de cuisson par induction (1) selon la revendication 4, caractérisée en ce qu'un détecteur à IR (4a) est disposé dans chacun des trous (L) des bobines d'induction (3).
  6. Table de cuisson par induction (1) selon la revendication 4, caractérisée en ce que, pour les bobines d'induction (3) disposées en assemblage hexagonalement très dense, un détecteur à IR (4a) est disposé dans seulement quelques trous (L) de l'assemblage hexagonalement très dense des bobines d'induction (3).
  7. Table de cuisson par induction (1) selon l'une des revendications précédentes, caractérisée en ce que le au moins un détecteur à IR (4) est disposé de telle sorte qu'une quelconque surface circulaire sur la table de cuisson (1) d'un diamètre d'au moins 20 cm comprend au moins un détecteur à IR (4z).
  8. Table de cuisson par induction (1) selon la revendication 7, caractérisée en ce que plusieurs détecteurs à IR (4, 4z) sont disposés en dessous de la plaque de préparation (2) et latéralement à côté des bobines d'induction (3) de telle sorte qu'une quelconque surface circulaire sur la table de cuisson (1) d'un diamètre d'au moins 20 cm comprend au moins deux détecteurs à IR (4z).
  9. Table de cuisson par induction (1) selon l'une des revendications précédentes, caractérisée en ce que la table de cuisson par induction (1) est prévue pour:
    - à des fins de mise en service de telle vaisselle destinée aux préparations, reconnaître les bobines d'induction (3z) utilisées,
    - sur base des bobines d'induction (3z) reconnues, déterminer quels détecteurs à IR (4z) sont recouverts de telle vaisselle destinée aux préparations (Z) et
    - ne solliciter, pour la détermination de la température de telle vaisselle destinée aux préparations (Z), que ces détecteurs à IR (4z).
  10. Table de cuisson par induction (1) selon la revendication 9, caractérisée en ce que la table de cuisson par induction (1) est prévue pour:
    - sur base des bobines d'induction (3z) reconnues, déterminer les détecteurs à IR (4z) qui sont recouverts par la zone marginale de telle vaisselle destinée aux préparations (Z), et
    - ne solliciter, pour la détermination de la température de telle vaisselle destinée aux préparations (Z), que ces détecteurs à IR (4z).
EP13713230.4A 2012-02-10 2013-01-29 Table de cuisson par induction à champ de bobines d'induction Active EP2813129B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES201230203 2012-02-10
PCT/IB2013/050755 WO2013118027A1 (fr) 2012-02-10 2013-01-29 Table de cuisson par induction à champ de bobines d'induction

Publications (2)

Publication Number Publication Date
EP2813129A1 EP2813129A1 (fr) 2014-12-17
EP2813129B1 true EP2813129B1 (fr) 2019-03-13

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ID=48040375

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13713230.4A Active EP2813129B1 (fr) 2012-02-10 2013-01-29 Table de cuisson par induction à champ de bobines d'induction

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EP (1) EP2813129B1 (fr)
WO (1) WO2013118027A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8976158B2 (en) 2009-02-15 2015-03-10 Neonode Inc. User interface for white goods and associated multi-channel proximity sensors
EP2670211A3 (fr) * 2012-05-31 2014-08-13 BSH Bosch und Siemens Hausgeräte GmbH Dispositif de champ de cuisson
WO2015062859A1 (fr) * 2013-11-04 2015-05-07 BSH Hausgeräte GmbH Dispositif de cuisson équipé d'une plaque de chauffage
ES2786279T3 (es) * 2013-12-11 2020-10-09 Bsh Hausgeraete Gmbh Dispositivo de campo de cocción
DE102014224051A1 (de) * 2014-11-25 2016-05-25 E.G.O. Elektro-Gerätebau GmbH Induktionskochfeld und Verfahren zur Steuerung eines Induktionskochfelds
ES2585888B1 (es) * 2015-04-09 2017-07-18 Bsh Electrodomésticos España, S.A. Dispositivo de campo de cocción
EP3297399B1 (fr) * 2015-05-13 2021-03-17 Panasonic Intellectual Property Management Co., Ltd. Dispositif de cuisson à chauffage par induction
ES2684518B1 (es) * 2017-03-30 2019-07-12 Bsh Electrodomesticos Espana Sa Dispositivo de campo de coccion
EP3609293B1 (fr) * 2018-08-06 2021-11-10 Electrolux Appliances Aktiebolag Table de cuisson électroménagère

Family Cites Families (4)

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Publication number Priority date Publication date Assignee Title
DE102004015255A1 (de) * 2004-03-29 2005-10-13 BSH Bosch und Siemens Hausgeräte GmbH Kochsensorik
DE102006026907A1 (de) * 2006-06-09 2008-01-03 BSH Bosch und Siemens Hausgeräte GmbH Induktionskochmulde und Verfahren zur Ermittlung einer Temperatur eines Bodens eines Zubereitungsbehälters
WO2011148568A1 (fr) * 2010-05-28 2011-12-01 三菱電機株式会社 Réchaud à chauffage par induction
KR101513698B1 (ko) * 2010-07-28 2015-04-20 삼성전자 주식회사 온도센서 및 이를 갖는 유도가열조리기

Non-Patent Citations (1)

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Title
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Publication number Publication date
WO2013118027A1 (fr) 2013-08-15
EP2813129A1 (fr) 2014-12-17

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